There are several logs associated with each minor compaction.  Grep your logs for "Compacting".

On Mon, Sep 3, 2012 at 7:41 AM, Satoshi Yamada <bigtvioletblue@yahoo.co.jp> wrote:
hi,

i know minor compaction is caused when the num of SSTable
exceeds the thresholds.

then, is there anyway to find what time minor compaction happened?
is minor compaction output into log?

thanks,
satoshi



--
Tyler Hobbs
DataStax